Dell Precision M4500 Intel Core i7 CPU M 640 @ 2.80GHz, 4 GB RAM, 250 GB HDD with Microsoft Windows 10 Professional and Microsoft Office 2010 Home & Business.
Crucial Technology 8GB Upgrade for a Dell Precision M4500 System (DDR3 PC3-12800, Non-ECC,) at Amazon.com
Dell Precision M4500 Review: A Workstation with High Precision
A-Tech 16GB KIT (2 x 8GB) For Dell Precision Notebook Series Mobile Workstation M4500 Mobile Workstation M4500 (Quad Core) Mobile Workstation M4600 M. SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory at Amazon.com
CMS 8GB (2X4GB) DDR3 10600 1333MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Dell® Precision Mobile Workstation M4500 - A29 System Specific Memory - Newegg.com
How to upgrade DELL Precision M4500 up to 16GB RAM | cmexonat's blog
Dell Precision M4500 Review: A Workstation with High Precision